Deutsche Bank has erected a seven-story sign in the heart of New York City that ticks off the tons of carbon dioxide being emitted into the atmosphere — a public relations move designed to raise awareness of global warming.

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Designed by scientists at the Massachusetts Institute of Technology and hanging outside Madison Square Garden, the giant counter shows that the amount of carbon dioxide in earth’s atmosphere is at 3.64 trillion metric tons, the highest level in 800,000 years. Number whirring on the counter show that CO2 is being added to the atmosphere at the rate of 800 tons per second.